Panasonic WV-CS950 / WV-CS954E Service Manual ▷ View online
WV-CS950 series Circuit Explanation
Video Signal Flow
These camers are composed of 5 circuit boards such as, Sensor Board, Main
Board, Servo Board, Communication Board and Power Board.
The Main Board consists of 3 sub-circuit boards such as Drive Board, Digital
Board and Auto Focus Board.
The WV-CS950 has 3 CUPs – they are located on the Main board, Servo board
and Communication baord.
The CCD output signal from Sensor Board enters to the Drive Board,IC1501
、
pin27 (S/H, AGC, Gamma, Amp. A/D). The output signal from IC1501 is a 12
bits digital signal.
The 12bits digital video signal (ADC(0-11)) is supplied to IC2 (Process/Encoder)
on the Digital Board.
IC2 generates Y-signal (pinW15), C-signal (pinW16), Sync-signal (pinAB6) and
Data 1 (pinAA5).
These signals are supplied to pin39, pin34, pin37 and pin36 of IC201 (Video
Out) respectively. IC201 is located on the Auto Focus board.
In IC201, the composite video output signal is made and is output from pin28.
The video output signal is supplied to the CN4, pin3 on the Digital board then
enters to the Servo Board via CN1, pin22. After that this video signal is
supplied to the amplifier circuit (Q6-Q14) then it enters to the Slip Ring.
After passing the Slip Ring, the video output signal is appeared at the CN, pin7
on the Communication Board.
[There is a photo coupler in the Slip Ring. Only the video output signal passes
the photo coupler. The other signals such as RS485 signal, alarm signal,
12VDC, LP, Dip SW pass the brush contacts in the Slip Ring.]
Q19-Q33 circuit in the Communication Board amplifies the video output signal
from photo coupler. After that, the video output signal appears at CN3, pin3
then it goes out to the BNC cable through the Base Unit.
-1-
The video output signal will be connected to the camera controller unit.
The camera control command signal from camera controller unit is multiplexed
on the video signal at CN3, pin3 on the Communication Board.
This multiplexed video signal (Video FB) will be fed back to IC201, pin27 (Auto
Focus Board) via CN7, pin6 (Communication Board)
Æ Slip Ring Æ CN3, pin3
(Servo Board)
Æ CN1, pin23 (Servo Board) Æ CN4, pin2 (Digital Board).
In IC201, the camera control command (Data 2) will be separated from video
signal and is appeared at pin24 of IC201 then supplied to pinY6 of IC2.
The data 2 will be supplied to IC1 (CPU). The Data 2 contains the lens control
signal, pan/tilt control signal and camera menu control signal.
Drive Board
In IC1501, there are 5 major functions such as CCD noise reduction (S/H), AGC,
Gamma correction, Amplifier and A/D convertor.
The CCD H-drive signals are generated by IC1501. The CCD V-drive signals are
generated by IC2 then supplied to CCD through IC301 (Driver).
IC300 is a DAC (Digital to Analog Converter) which converts the serial data
(SDOUT) from IC1 (CPU) to analog command
data.(CH6,CH8,CH9,CH10,CH11).
Auto Focus Board
The CPU (IC1) on the Digital Board sends out the lens control signal
(AFDRTXD) from pin28.
This signal is supplied to IC203 (Lens Motor Driver) pin34 on the Auto Focus
Board.
The auto focus control signals (C1/C2/D1/D2) and zoom control signals
(A1/A2/B1/B2) are generated by IC203 and are supplied to the lens.
IC204 is an ALC control IC. The analog data (CH10) from IC300 is supplied to
IC204, pin2. IC204 generates the iris drive signal to the lens.
The lens sends back a damper signal to the IC204.
-2-
IC202 is a Day/night filter switching IC. The filter switching signal (BW1,BW2)
is supplied from IC1 (CPU), pin22,pin24 to IC202, pin6,pin9..
IC200 is a Temperature Detector IC. When the temperature rises to 25 deg. C,
the fan starts to operate. When the temperature downs to 10 deg. C, the fan
stops operation. [The detected signal from IC200 is supplied to IC1, pin91.]
The tilt Hall IC (VS901) is located on the Tilt Hall IC Board which is connected
with the Auto Focus Board.
When the power of the WV-CS950 is turned on, the Hall IC scans on the magnet
which is located on the chassis. There are two magnets. Then the Hall IC
generates two pulses – the one end and the other end.
These pulses are buffered by IC112 which is located on the Auto Focus Board.
These pulses are supplied to pin54, pin55 of IC6 (CPU) on the Servo Board via
CN4, pin22,pin23 (Digital Board)
ÆCN1, pin2,pin3 (Servo Board).
Consequently, the CPU memorizes the reference position of the tilt motor.
Digital Board:
The Process/Encoder IC (IC2) receives a 12 bits digital video signal from IC1501.
Then IC2 produces the Y-signal, C-signal, Sync-signal and Data 1.
The IC1 (CPU) sends out the control signals to IC2 to produce these signals.
The IC8 (Flash ROM) is connected to IC1 (CPU). The firmware is stored in this
flash ROM.
IC5 is a EEPROM for IC1 and stores the setup menu data..
Servo Board:
The Servo Board is composed of the Pan/Tilt Motor Control circuit, the Data
Multiplex/DeMultiplex circuit and Power Regulator circuit.
1. Pan/Tilt Motor Control circuit:
The Pan Motor Control circuit and the Tilt Motor Control circuit are identical.
The Pan Motor Control circuit is described as an example.
-3-
When the camera controller is operated, the Pan Motor Control signal is
supplied to pin27 of IC201 through the Slip Ring.
The Pan Motor Control signal is separated in IC201 then it is supplied to pinY6
of IC2. The control data is converted to 8-bits parallel data (AD1-AD8) and it is
output from of IC2 then supplied to pin61-69 of IC1 (CPU).
In IC1, the 8-bits parallel data is converted to the serial data. Then this serial
data (SADOUT) is output from pin99 of IC1 then supplied to pin58 of IC6
(CPU) on the Servo Board via CN4, pin16 (Digital Board)
Æ CN1, pin9 (Servo
Board).
The motor drive data is output from pin15 of IC6 and it is supplied to pin17 of
IC7 (D/A Converter). The output signal from pin18,pin4 of IC7 are supplied to
pin3,pin5 of IC9 (OP Amp.) The output signal from pin1 of IC9 is supplied to
pin22 of IC15 (Pan Motor Driver).
The Pan Motor is a stepping motor. The power for the Pan Motor is output
from pin3(U),pin4(V),pin6(W) of IC15.
When the panning direction becomes reversed, the reverse command is
output from pin19 of IC6 and it is supplied to pin24 of IC15.
The H1,H2,H3 pulses are fed back from Pan Motor to pin9-pin16 of IC15.
These signals are used for detecting the panning speed of Pan Motor.
There is a Hall IC (MRA/MRB) on the Pan Motor board. This Hall IC
generates 2 pulses and they are supplied to pin4, pin7 of IC11 (Pan Position
Detector) via CN5, pin11,pin17. The IC11 counts the number of pulses then
it is supplied to IC6, pin63,pin64. Then IC6 finds out the position of the Pan
Motor.
The Pan Hall IC (VS1) is located on the Servo Board. When this VS1 scans
the magnet, which is located on the chassis, VS1 generates one pulse and it
is supplied to pin3 of IC8. The output signal from IC8, pin8 is supplied to pin55
of IC6 (CPU).
-4-
Click on the first or last page to see other WV-CS950 / WV-CS954E service manuals if exist.